Perfluorinated Compounds (PFAS) vs Tertiary Butylhydroquinone: which is worse?

What is Perfluorinated Compounds (PFAS)?

Per- and polyfluoroalkyl substances (PFAS) are a large family of synthetic chemicals characterized by extremely strong carbon-fluorine bonds. They are used in food packaging (grease-resistant coatings), non-stick cookware (PTFE/Teflon), food processing equipment, firefighting foam, and many industrial applications. The 'forever chemicals' moniker reflects their extreme environmental persistence.

What is Tertiary Butylhydroquinone?

Tertiary butylhydroquinone (TBHQ) is a synthetic phenolic antioxidant preservative derived from butane. It is one of the most potent antioxidants for polyunsaturated fats and oils and is commonly used in fast-food frying oils. Its chemical formula is C10H14O2.

Documented risks

Perfluorinated Compounds (PFAS): PFAS are among the most extensively studied and harmful groups of synthetic chemicals in the modern environment. Their unique carbon-fluorine bond stability means they do not break down in the environment or in human body tissues — contributing to bioaccumulation over a lifetime. Health effects documented in human epidemiological studies include: - Cancer: PFOA (perfluorooctanoic acid) and PFOS (perfluorooctanesulfonic acid) have been associated with kidney cancer, testicular cancer, thyroid cancer, bladder cancer, and non-Hodgkin lymphoma in occupationally exposed workers and community members with contaminated drinking water. IARC classified PFOA as Group 1 (human carcinogen) in 2023 and PFOS as Group 2B. - Endocrine disruption: PFAS disrupt thyroid hormone signaling and sex hormone balance. Multiple studies find associations between PFAS exposure and hypothyroidism, early puberty in girls, and reduced sperm quality. - Immune suppression: studies have found that PFAS exposure is associated with reduced vaccine response in children and adults, suggesting PFAS may impair immune function. - Developmental effects: prenatal PFAS exposure has been associated with lower birth weight, developmental delays, and reduced immune response in infants. - Cholesterol: PFAS exposure consistently raises LDL cholesterol levels, increasing cardiovascular disease risk. The 2023 EPA MCLG (maximum contaminant level goal) for PFOA and PFOS is zero — reflecting the agency's conclusion that there is no safe level. The EPA set enforceable MCLs in drinking water in 2024. The DuPont/3M PFOA/PFOS contamination of drinking water in communities near Teflon manufacturing facilities led to a $671 million settlement (DuPont/Chemours, 2017) and $10.3 billion 3M settlement (2023) — among the largest environmental contamination settlements in history.

Tertiary Butylhydroquinone: At high doses in animal studies, TBHQ has been shown to cause precancerous stomach lesions (squamous cell hyperplasia) in female rats. A study in Food and Chemical Toxicology documented these dose-dependent precancerous changes. The FDA limits TBHQ to 0.02% of fat content, reflecting dose-dependent safety thresholds. Immune function concerns emerged from research published around 2019-2020. A study (Farouk Musa and colleagues) found that TBHQ impaired the adaptive immune response to influenza in mouse models, including reduced effectiveness of influenza vaccination. EWG highlighted this research in its analysis. These findings have not been confirmed in human clinical trials but raised new dimensions of concern beyond cancer. Neurotoxicity: animal studies have documented TBHQ can cause precursors to certain types of cell injury in neural tissue at high doses, though effects at typical dietary exposure are not established. Allergic reactions including urticaria and contact dermatitis from TBHQ-containing cosmetics and personal care products are documented in dermatology literature. Japan banned TBHQ for food use. The EU restricts it in baby food (completely banned) and in adult food categories with maximum permitted levels. Australia and the UK restrict it.